Police said they were called to the pond after someone reported a 63-year-old man from Lincoln, Mass., was last seen swimming. Authorities did not know if the man encountered trouble in the water or if he swam across the lake and made it to shore.

Police said the man told his wife before the swim that he might try to swim across Walden Pond.

Police searched for several hours Sunday night before suspending the search until daylight Monday.

FROM BOSTON NEWS LEADER, THIS NEWSCENTER 5 AT 11:00. BREAKING NEWS. WALDEN POND, A SEARCH FOR A MISSING SWIMMER. CREWS ARE IN THE WATER AND THE AIR RIGHT NOW. WHAT IS THE LATEST? WE CAN TELL YOU SOME OF THE THINGS INCLUDING THE DIVE TEAM HAVE GOTTEN OUT OF THE WATER. YOU CAN SEE IT IS A VERY ACTIVE SCENE. THE FIRE DEPARTMENT HAS BOATS ON THE WATER LOOKING FOR THE MAN WHO WENT SWIMMING AND HAS NOT BEEN SEEN CENTS. THEY ARE SEARCHING IN THE AIR AND IN THE WATER. CREWS ON ATVS, THE WOODS. -- COMB THE WAS. NO SIGN OF THE 63-YEAR-OLD MAN. ONE ADULT MALE SEPARATED FROM THE OTHER TWO PEOPLE SWIMMING. HE WAS REPORTED SUBSEQUENTLY REPORTED MISSING. WALDEN POND THEY PLANNED TO SWIM DIAGONALLY ACROSS -- THEY PLAN TO SWIM DIAGONALLY ACROSS WALDEN POND. 2 OTHER MEN WERE SWIMMING WITH, AND THEY WERE CONSIDERED BETTER SWIMMERS. THEY SWIM TO THEIR POINT. THEY CAME BACK AND REALIZED HE AND NOT BEEN FOUND. AUTHORITIES WANT THE PUBLIC TO KNOW THAT WALDEN POND WILL BE